Soak the chicken pieces in buttermilk for 15 minutes at room temperature.
Combine flour, white pepper, paprika, garlic powder, onion powder, thyme, and oregano in a large bowl.
Remove chicken from buttermilk, dredge each piece in the seasoned flour mixture, and press firmly to coat.
Heat avocado oil to 350°F / 175°C in a deep skillet or Dutch oven.
Fry the chicken in batches for 16 to 18 minutes, turning once, until golden brown and the internal temperature reaches 165°F / 74°C at the thickest part.
Transfer to a wire rack and rest for 5 minutes before serving to keep the coating crisp.